ISSN No.: 2455-6130 Volume 1, Issue 2, 2016, pp. 24-34 International Journal of Emerging Trends in Research 24 website: www.ijoetr.com International Journal of Emerging Trends in Research Abstract Ultrasonic machining is a contemporary manufacturing method usually employed for processing materials with higher hardness/brittleness such as quartz, semiconductor materials, ceramics etc. The machined surface produced by ultrasonic machining is found to be free from any surface defects (heat affected zone, cracks, recast layer, etc.) in contrast to the thermal based machining processes like; electric discharge machining, laser beam machining etc. In this article, a review has been reported on the fundamental principle of ultrasonic machining, effect of operating parameters on material removal rate, tool wear rate, and surface roughness. Keywords: ultrasonic machining; material removal rate; tool wear rate; surface roughness. 1. Introduction In the today’s era of advancement, several industries such as; nuclear reactors, aerospace, aircraft and automobile have been observed to encounter umpteen issues regarding the efficient processing of advanced engineering materials. The conventional machining solutions are unable to process such materials effectively. Hence, different advanced machining processes including abrasive jet machining, ultrasonic machining, electrochemical machining, electrical discharging machine (EDM), wire-cut EDM, etc. are employed to machine these technically advanced materials. The contemporary machining methods process the material irrespective of its mechanical properties such as strength, hardness, toughness or brittleness. The non-traditional machining processes are classified on the basis of type of energy sources used such as; mechanical, electrical, chemical or thermal etc, which cause the removal of work material through different mechanisms. A review on ultrasonic machining Ravinder Kataria 1, *, Jatinder Kumar 1 , B.S. Pabla 2 1 Department of Mechanical Engineering, National Institute of Technology, Kurukshetra (Haryana), India 2 Department of Mechanical Engineering, NITTTR, Chandigarh, India * Corresponding author. E-mail: kataria.ravinder07@gmail.com (Ravinder Kataria)